Improvement in oscillating balance steam-valves



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JOHNv O. BROMLEY, OF ROOK ISLAND, ILLINOIS.

Letters Patent No. 111,513, daad February 7, 1871.

IMPROVEMENT N -osc|i.|.AT|Ne BALANCE STEAM-VALVES.

The Schedule referred to in these Letters Patent and making part of vthe same.

To all whom 'it may concern Y Be itknown that I, JOHN C. BnoMnnY, of Rock Island, in the countyof Rock Island and State of Illinois, have invented certain new and useful Improvcnients' in the steam-valve known as the O'scil` 'lating Balance Steam-Valve, and I do hereby declare that the followingis a full, clear, and exact -description thereof', reference being had to the acconipanying drawings making part of this specification, `and to. the letters of reference ,marked thereon, like letters indicating like parts wherever they occur.

To enablev others skilled in the art to construct and use my invention, I will proceed to describe it.

In the drawingsy Figure 1 is a top view.

Figure 2 is a Vertical section` looking toward the interior of face plate A. Figure 3 is a vertical section taken between face plate A and segmental valve F. Figure 4 isa vertical longitudinal section. L 'represents the valve-case, consisting of a short cylinder. K

A is the ace plate, provided with the steam and exhaust. passages, ports B and C, respectively, laid olf in thesegment of acircle.

The cylindei'Lis closed at the end opposite the face plate by a cap 1er head, L', tp which is attached the small cylinder D.

' Through the center of the latter passes the sliding shaft E, supporting the segmental valve F, which is designed to work over the ports B and O.

0n the. opposite end of the shaft Eis a balance plate,

G, which also serves asaft cap, for the purpose of closing the steam-chamber entirely, receiving the press- .ure of steam. and closing the valve-chamber -at the same time.

In the front of the face plate A is a stuiugbox, H.

.Upon theend ofthe shaft E is an arm, I, pro- I vided with a wrist, to'whichcan be attached the eccentric or cam-.rod of an ordinary engine.

The end of the shaft E which reaches beyond the cylinder I), is turned to a conical point, which oscillates in a corresponding socket, formed inthe end of a set-screw M, which is supported by a bracket, Q,

secured rigidly to the cap L.

F represents the segmental balance valve, formed of the segmental wings f, in each of which is formed a recess, j",`as shown in Iig. 3, which, during the oscillation of the valve passes alternatelyover the steam and exhaust-ports B and O.

The steam is supplied through a pipe, K, and at eachoscillationis admitted to the ports' B alte'rnately leading tothe engine cylinder, and, returning in like g manner through the ports B, escapes by means of the communication effected. by the recesses f', passes oi through the exhaust-ports C.

'lhe adjustable nut N is designed to secure the balance plate Gto the shaft E, and to regulate the distance between that plate and the valve. A piston may .be used instead of the balance plate G.

Whenstcain is admitted through' K it fills -the steamchan'iber, and presses upon the valve F with such force as-to cause considerable friction, but the pressure against the plate G, which is securely attached to the shaft E ofthe valve I counterbalances the pressure upon valve F and relieves it or the friction. At the sa-nie time the position of plate Gis so adjusted, by means of the set-screw M and nut N, that there is no escape of steam around the cap plate G.

Having fully described my invention,

The, arrangement and application of the bracket (bl, set-screw'M, stung-hox H, and adjustable nut N, attached t-o thebalance plate G, as and for the purpose set forth.`

JOHN U. BROMLEY.

Witnesses: e

O. F. HEMENWAY, E. H. GLmsoN. 

